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70 gpm! are you sure? IS this a well used for farming? one inch poly should not get more than 18 gpm. It has to do with velocity. So If your numbers are correct I would change your main lines to 1.5 inch and laterals should be 1 inch.

They don't relate...read the chart across...the #9 puts out 5.2 gallons at 50psi

In my opinion you would be better off splitting into separate zones if you can....16 heads even with number 1 nozzles will be pushing it..saddles or no saddles...1 inch poly is going to struggle. The water source is important, but you are limited by the 1 inch poly....

sprinkler calculations

i have a large lawn area with 16 Hunter PGJ heads turning from 1/4 to full circle. present installation has 1 inch irrigation tubing with "saddle clamps" and 1/2 inch openings to short sections of rubber tubing supplying the Hunter rotors. i need to rebuild the system to increase the water to the sprinkler heads. i want to do this by removing all the 1/2 inch saddle clamps and using 1 inch "T" fittings with the sprinkler heads on stem of the T. Source of my water is a deep well pump supplying 70 gallons per minute at 60 pounds per square inch. how do i determine whether the existing 1 inch supply line will give me enough water to run all 16 heads? A second question is how do relate the Hunter Nozzle Performance data to the little numbers on the nozzles. i have a number 9 on the nozzle. how do that relate to the o.75, 1.0, etc on the chart?